﻿// Copyright (c) 2012, Alexander Endris
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#region Usings

using System.Collections.Generic;
using System.IO;
using System.Text;

#endregion

namespace Lyricsgrabber.Core.Tags.APE
{
  internal class ApeTag : Tag
  {
    #region Public / Constructors

    public ApeTag(string fileName)
    {
      using (Stream str = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
      using (BinaryReader reader = new BinaryReader(str))
      {
        str.Seek(-32, SeekOrigin.End);
        string tag = new string(reader.ReadChars(8));

        if (tag != Tag)
          throw new InvalidDataException("The specified file does not contain an APE tag!");

        int version = reader.ReadInt32();
        int tagSize = reader.ReadInt32();
        int numberOfItems = reader.ReadInt32();
        int globalFlags = reader.ReadInt32();

        str.Seek(-tagSize, SeekOrigin.End);

        metadata = new List<IMetadata>(numberOfItems);

        for (int i = 0; i < numberOfItems; i++)
        {
          int itemValueSize = reader.ReadInt32();
          int itemFlags = reader.ReadInt32();

          List<byte> keyBytes = new List<byte>();

          byte b = reader.ReadByte();
          while (b != 0)
          {
            keyBytes.Add(b);
            b = reader.ReadByte();
          }

          string key = Encoding.ASCII.GetString(keyBytes.ToArray());
          string value = Encoding.UTF8.GetString(reader.ReadBytes(itemValueSize));

          metadata.Add(new ApeTagItem(key, value));
          
        }
      }

    }

    #endregion

    #region Public / Methods

    public override void Save()
    {
    }

    #endregion

    #region Private / Methods

    public static readonly string Tag = "APETAGEX";


    #endregion
  }
}